First of , remember that u need 2 download all the files first, before u can extract them. seconldy, since u would be the free user of rapidshare I suppose, in that case if you r using Modem just restart ur modem after the downlaod of every part. And wait for like 30secs to a minute so ur modem get a new dynamic IP.
That ensures that Rapidshare allows u to download other parts. Normally, for free users, rapidshare puts a time based restriction after you download the file from that site. That restriction is based on the size of the file and tells you to wait for xyz minutes. hence u need 2 do the above procedure.
The links i gave above are working. Hope this helps....